<template>
	<div>
	<div class="shopcart">
		<div class="content" @click="toggleList">
			<div class="content-left">
				<div class="logo-wrapper">
					<div class="logo" :class="{'highlight':totalCount>0}">
						<i class="iconfont icon-shopcart"></i>
					</div>
					<div class="num">{{totalCount}}</div>
				</div>
				<div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
				<div class="desc">另需配送费￥{{deliveryPrice}}</div>
			</div>
			<div class="content-right" @click.stop.prevent="pay">//阻止冒泡和默认事件
				<div class="pay" :class="payClass">
					{{payDesc}}
				</div>
			</div>
		</div>
		<div class="ball-container">
	        <div v-for="ball in balls">
				<transition name="drop" @before-enter="beforeDrop" @enter="dropping" @after-enter="afterDrop">
					<div class="ball" v-show="ball.show">
						<div class="inner inner-hook"></div>
					</div>
				</transition>
	        </div>
	    </div>
	    <transition name="fold">
		    <div class="shopcart-list" v-show="listShow">
		    	<div class="list-header">
		    		<h1 class="title">购物车</h1>
		    		<span class="empty" @click="empty">清空</span>
		    	</div>
		    	<div class="list-content" ref="listcontent">
		    		<ul>
		    			<li class="food" v-for="food of selectFoods">
		    				<span class="name">{{food.name}}</span>
		    				<div class="price">
		    					<span>￥{{food.price*food.count}}</span>
		    				</div>
		    				<div class="cartcontrol-wrapper">
		    					<cartcontrol :food="food" @cart-add="cartAdd"></cartcontrol>
		    				</div>
		    			</li>
		    		</ul>
		    	</div>
		    </div>
	    </transition>
	</div>
	<transition name="fade">
		<div class="list-mask" v-show="listShow" @click="hideList"></div>
	</transition>
	</div>
</template>
<script>
import Bscroll from 'better-scroll'
import cartcontrol from '@/components/cartcontrol/cartcontrol.vue'	
export default{
	props:{
		deliveryPrice:Number,
		minPrice:Number,
		selectFoods:{
			type:Array,
			default(){
				return [];
			}
		}
	},
	components:{
		cartcontrol
	},
	data(){
		return{
			balls: [{
				show: false
				},{
				show: false
				},{
				show: false
				},{
				show: false
				},{
				show: false
			}],
	        dropBalls: [],
	        fold:true
		}
	},
	computed:{
		totalPrice(){
			let total=0;
			this.selectFoods.forEach((data)=>{
				total+=data.price*data.count;
			})
			return total
		},
		totalCount(){
			let count=0;
			this.selectFoods.forEach((data)=>{
				count+=data.count;
			})
			return count
		},
		payDesc(){
			if(this.totalPrice===0){
				return '￥'+this.minPrice+'元起送'
			}else if(this.totalPrice<this.minPrice){
				let diff=this.minPrice-this.totalPrice;
				return '还差￥'+diff+'元起送'
			}else{
				return '去结算'
			}
		},
		payClass(){
			if(this.totalPrice<this.minPrice){
				return 'not-enough';
			}else{
				return 'enough';
			}
		},
		listShow(){
			if(!this.totalCount){
				this.fold=true
				return false
			}
			let show=!this.fold
			if(show){
				this.$nextTick(()=>{
					if(!this.scroll){
						this.scroll=new Bscroll(this.$refs.listcontent)
					}else{
						this.scroll.refresh();
					}
				})
			}
			return show
		}
	},
	methods: {
      drop(el) {
        for (let i = 0; i < this.balls.length; i++) {
          let ball = this.balls[i];
          if (!ball.show) {
            ball.show = true;
            ball.el = el;
            this.dropBalls.push(ball);
            return;
          }
        }
      },
      beforeDrop(el) {
        let count = this.balls.length;
        while (count--) {
          let ball = this.balls[count];
          if (ball.show) {
            let rect = ball.el.getBoundingClientRect();
            let x = rect.left - 32;
            let y = -(window.innerHeight - rect.top - 22);
            el.style.display = '';
            el.style.webkitTransform = `translate3d(0,${y}px,0)`;
            el.style.transform = `translate3d(0,${y}px,0)`;
            let inner = el.getElementsByClassName('inner-hook')[0];
            inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
            inner.style.transform = `translate3d(${x}px,0,0)`;
          }
        }
      },
      dropping(el, done) {
        /* eslint-disable no-unused-vars */
        let rf = el.offsetHeight;
        this.$nextTick(() => {
          el.style.webkitTransform = 'translate3d(0,0,0)';
          el.style.transform = 'translate3d(0,0,0)';
          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.webkitTransform = 'translate3d(0,0,0)';
          inner.style.transform = 'translate3d(0,0,0)';
          el.addEventListener('transitionend', done);
        });
      },
      afterDrop(el) {
        let ball = this.dropBalls.shift();
        if (ball) {
          ball.show = false;
          el.style.display = 'none';
        }
      },
      toggleList(){
      	if(!this.totalCount){
      		return
      	}
      	this.fold=!this.fold
      },
      empty(){
      	this.selectFoods.forEach((food)=>{
      		food.count=0;
      	})
      },
      hideList(){
      	this.fold=true;
      },
      pay(){
      	if(this.totalPrice<this.minPrice){
      		return
      	}
      	window.alert(`支付${this.totalPrice}`)
      },
      cartAdd(el){
		this.$nextTick(() => {
	        // 调用shopcart组件的drop()函数
	　       this.drop(el);　
	    });
	}
    }
}
</script>
<style lang="stylus" scoped>
	
.shopcart{width:100%;position:fixed;left:0;bottom:0;z-index:50;height:48px;}
.content{display:flex;background:#141d27;font-size:0;}
.content-left{flex:1;}
.logo-wrapper{display:inline-block;position:relative;top:-10px;margin:0 12px;padding:6px;width:56px;height:56px;box-sizing:border-box;vertical-align:top;border-radius:50%;background:#141d27;}
.logo{wdith:100%;height:100%;border-radius:50%;background:#2b343c;text-align:center;}
.logo i.icon-shopcart{font-size:24px;line-height:44px;color:#80858a;}
.logo-wrapper .highlight{background:rgb(0,160,220);}
.logo-wrapper .highlight i.icon-shopcart{color:#fff;}
.num{position:absolute;top:0;right:0;width:24px;height:16px;line-height:16px;text-align:center;border-radius:16px;font-size:9px;font-weight:700;color:#fff;background:rgb(240,20,20);box-shadow:0 4px 8px 0 rgba(0,0,0,0.4);}
.price{display:inline-block;vertical-align:top;line-height:24px;margin-top:12px;box-sizing:border-box;padding-right:12px;border-right:1px solid rgba(255,255,255,0.1);font-size:16px;font-weight:700;color:rgba(255,255,255,0.4);}
  &.highlight{color:#fff;}
.desc{display:inline-block;vertical-align:top;margin:12px 0 0 12px;color:rgba(255,255,255,0.4);font-size:10px;line-height:24px;}
.content-right{flex:0 0 105px;width:105px;}
.pay{font-size:12px;line-height:48px;height:48px;text-align:center;color:rgba(255,255,255,0.4);font-weight:700;background:#26333b;}
  &.not-enough{background:#26333b;}
  &.enough{background:#00b43c;color:#fff;}
  
.ball-container
	.ball
		position: fixed
		left: 32px
		bottom: 22px
		z-index: 200
		transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
		.inner
			width: 16px
			height: 16px
			border-radius: 50%
			background: rgb(0, 160, 220)
			transition: all 0.4s linear
.shopcart-list{position:absolute;top:0;left:0;z-index:-1;width:100%;transform: translate3d(0, -100%, 0);}	
.fold-enter-active, .fold-leave-active{transition: all 0.5s}
.fold-enter, .fold-leave-active{transform: translate3d(0, 0, 0)}
.list-header{height:40px;line-height:40px;padding:0 18px;background:#f3f5f7;border-bottom:1px solid rgba(7,17,27,0.1);}
.list-header .title{float:left;font-size:14px;color:rgb(7,17,27);}
.list-header .empty{float:right;font-size:12px;color:rgb(0,160,220);display:inline-block;}
.list-content{padding:0 18px;max-height:217px;background:#fff;overflow:hidden;}	
.list-content .food{position:relative;padding:12px 0;box-sizing:border-box;border-bottom:0.5px solid rgba(7,17,27,0.1);}
.list-content .food .name{line-height:24px;font-size:14px;color:rgb(7,17,27);}
.list-content .food .price{position:absolute;right:90px;bottom:12px;line-height:24px;font-size:14px;font-weight:700;color:rgb(240,20,20);}
.list-content .food .cartcontrol-wrapper{position:absolute;right:0;bottom:12px;}

.list-mask{position:fixed;top:0;left:0;width:100%;height:100%;z-index:40;opacity:1;background:rgba(7,17,27,0.6);backdrop-filter:blur(10px);}
.fade-enter-active, .fade-leave-active{transition: all 0.5s}
.fade-enter, .fade-leave-active{opacity:0;background:rgba(7,17,27,0);}
</style>